EFFA MANLEY FOUGHT FOR SOCIAL JUSTICE AND THE NEGRO LEAGUES. If you look deep into the history of the Baseball Hall of Fame, you will find one club owner enshrined who would fit seamlessly into the worldwide cultural revolution that is 2020. Effa Manley co-owned the Newark Eagles of the Negro National League with her husband, Abe, and her words and deeds from more than 80 years ago would be just as relevant today.